+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   873 Mechthild (A917 KJ) Classification: Main-belt Asteroid          SPK-ID: 2000873 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 32 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .149450280677087 3.4722e-08   a 2.627293705989703 8.0981e-09 au q 2.234643924208398 9.282e-08 au i 5.276331338839029 3.9013e-06 deg node 149.9957068319133 4.5438e-05 deg peri 109.9898337002551 4.7756e-05 deg M 48.26409380729413 1.4608e-05 deg tp 2458791.963048437411 (2019-Nov-04.46304844) 6.2961e-05 TDB period 1555.469017242511 4.26 7.1917e-06 1.969e-08 d yr n .2314414469265336 1.0701e-09 deg/d Q 3.019943487771008 9.3084e-09 au   Orbit Determination Parameters    # obs. used (total)      2676      data-arc span      37343 days (102.24 yr)      first obs. used      1917-05-21      last obs. used      2019-08-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .44774      source      ORB      producer      Otto Matic      solution date      2019-Sep-23 19:13:01   Additional Information  Earth MOID = 1.22607 au   Jupiter MOID = 2.06099 au   T_jup = 3.380  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 11.4   n/a MPO492760 IRAS observations used: 3 diameter diameter 34.471 km 0.103 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 11.006 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Lagerkvist, C.-I. (1978) Astron. Astrophys. Suppl. Ser. 31, 361-381.] [Warner, B.D. (2009) Minor Planet Bull. 36, 172-176.] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] [Garceran, A.C.; Aznar, A.; Mansego, E.A.; Rodriguez, P.B.; et al. (2016) Minor Planet Bull. 43, 92-97.] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] geometric albedo albedo 0.040   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.684   0.022 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=11.58 deg. U-B UB 0.319   0.037 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=11.58 deg. Tholen spectral type spec_T PC   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo 873 Mechthild (A917 KJ)          Discovered 1917-May-21 by Wolf, M. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Aug-03 09:37 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin